A simple resistance-based sensor is presented, consisting of wire contacts embedded at the edge of a carbon-fibre composite. The sensor proved capable of detecting barely visible damage, induced by a falling-dart impact tester, and accurately providing the damage location. It also proved possible to follow the progression of damage with increasing impact energies. The analysis of the results was straightforward and required no complex calculations. The incorporation of the sensor into practical composite manufacturing routines is also straightforward.
Rare earth (Eu3+)‐modified Pb(Mg1/3Nb2/3)O3‐PbTiO3 (PMN‐PT) polycrystalline ferroelectric ceramics were fabricated by high‐temperature solid‐state sintering, the phase structure, dielectric and piezoelectric properties were investigated. Eu3+ addition was found to significantly improve dielectric and piezoelectric properties of PMN‐PT, where the optimized properties were achieved for the composition of 2.5 mol%Eu: 0.72PMN‐0.28PT, with the piezoelectric d33 = 1420 pC/N, dielectric εr = 12 200 and electromechanical k33 = 0.78, respectively. All these results indicate that the Eu3+‐doped PMN‐PT ceramics are promising candidates for high‐performance room‐temperature piezoelectric devices.
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